usage of multiple static variables is discouraged #33
Description
I'm double-posting this issue, which shows up in pluginlib usage: ros/pluginlib#37
Using static pluginlib ClassLoader defers lib unloading to program shutdown time.
But as the order of static releases is undefined, the program might crash.
IMHO, class_loader shouldn't use a handful of unrelated static vars, but collect them within a singleton class, which is only freed when all loaded libs were unloaded.